msk0: interrupt storm

[Pavel Gorshkov]

On Wed, Apr 25, 2012 at 09:35:28AM -0400, John Baldwin wrote:
> Sadly, I spoke too soon.  With this patch applied I got another storm last night
> where this bit was not set during the storm:
> 
> index  cpu timestamp        trace
> ------ --- ---------------- ----- 
>     71   0   36775451301480 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     70   0   36775450145436 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     69   0   36775449956940 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     68   0   36775449768564 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     67   0   36775448604912 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     66   0   36775448416872 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     65   0   36775448220444 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     64   0   36775446569772 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     63   0   36775445385804 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     62   0   36775445189340 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     61   0   36775444984476 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     60   0   36775443829368 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     59   0   36775443640920 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     58   0   36775443444324 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
>     57   0   36775442272836 msk_intr: B0_Y2_SP_ISRC2 = 0x40000000
> 
> Apr 24 14:50:53 pipkin kernel: mskc0: TWSI ready
> Apr 24 14:50:54 pipkin kernel: mskc0: TWSI ready
> Apr 24 20:19:49 pipkin kernel: interrupt storm detected on "irq257:"; throttling interrupt source
> Apr 24 21:40:14 pipkin kernel: interrupt storm detected on "irq257:"; throttling interrupt source
> Apr 25 05:19:31 pipkin kernel: interrupt storm detected on "irq257:"; throttling interrupt source
> Apr 25 08:04:38 pipkin kernel: interrupt storm detected on "irq257:"; throttling interrupt source
> 
> (This trace was from the storm at 20:19:49.)

Same here, I just fired up rtorrent and immediately got a storm
accompanied by a 2 minute freeze:

irq259: mskc0                    6062100       8772
irq261: ahci0                       8380         12
Total                            6427430       9301